Which part of the nail unit is the primary site for nerve and blood vessel supply, supporting the entire nail?

• A. Nail plate
• B. Nail root
• C. Nail bed
• D. Lunula

Answer: (C)

The main idea being tested is how the nail gets its nourishment and sensation from the tissues beneath it. The nail bed, the tissue right under the nail plate, houses a rich network of nerves and blood vessels that supply nutrients and enable feeling for the entire nail as it grows. The nail plate itself is the hard, keratinized layer on top and has little to no blood supply, so it depends on the bed below for nourishment. The nail root is the growth area where new nail cells form, but it isn’t the primary supplier for the visible nail. The lunula is simply the visible part of the matrix at the base and reflects growth activity rather than being the main source of nourishment. So, the nail bed is the primary site for nerve and blood vessel supply, supporting the whole nail.